Which is a bad practice when dealing with hot or flammable items?

Using open flame near flammable materials is a bad practice. If the material gets too hot, it might release spark which can cause fire. So make it sure that there are no flammable items near you whenever you put a flame on.

Using an open flame near flammable liquids is a bad practice. If the material gets too hot, it might release spark which can cause fire. So make it sure that there are no flammable items near you whenever you put a flame on. Flammability is defined at how easily something will burn or ignite, causing fire or combustion. The degree of difficulty required to cause the combustion of a substance is subject to quantification through fire testing.